The acromioclavicular ac joint is a frequent site of injuries and degenerative pathology. It is the junction between the acromion part of the scapula that forms the highest point of the shoulder and the clavicle.
The Acromioclavicular Joint Musculoskeletal Key
The clavicle has been likened to a crank because of its double curve.

Ac joint anatomy. The acromioclavicular joint is formed by the outer end of the clavicle collar bone and the acromion process of the scapular shoulder blade. The ac joint is formed by the junction of the lateral clavicle and the acromion process of the scapula and is a gliding or plane style synovial joint. A minor ac joint sprain may involve stretching only of this ligament.
Unlike the shoulder joint the ac joint is small and has a limited range of motion and function. Physicians must have a good understanding of the anatomy and mechanics of this joint before treating patients with ac joint pathology. The ac joint is located above the glenohumeral joint true shoulder joint.
The acromioclavicular joint is between the small facet of the convex distal clavicle and flat medial acromionthe articular surfaces are lined with fibrocartilage like the sternoclavicular joint it is an atypical synovial joint. The acromioclavicular ac joint radiographic series is used to evaluate the acromioclavicular joint and the distal clavicle. Its distal or lateral end is flattened and it has prominent landmarks on its inferior surface.
The acromioclavicular joint ac joint is the articulation between the medial end of the acromion and the distal lateral end of the clavicle. Being a diarthrodial joint the ac joint is surrounded by a capsule and has an intraarticular synovium and an articular cartilage interface. The main ligament that joins the two bones is called the acromioclavicular ligament.
Several ligaments surround this joint. Indications ac radiographs are performed for a variety of indications including. Anatomical terminology edit on wikidata the acromioclavicular joint or ac joint is a joint at the top of the shoulder.
Shoulder trauma direct blows to th. Acromioclavicular joint motion the acromioclavicular joint is classified as a multiaxial synovial plane joint but it is more helpful to think of it as a pivot point. The acromioclavicular joint or ac joint is one of four joints that compride the shoulder complex.
As the name suggests it is the articulation of the acromion of the scapula with the clavicle. The acromioclavicular joint is located at the top of the shoulder where the acromion process and the clavicle meet to form a joint see the following image. The ac joint consists of an articulation between the lateral end of the clavicle and the acromion of the scapula.
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